Traditional model for calculating performance parameters of a fix-pad journal bearing leads to heavy workload, complicated and changeable formulae as it requires deriving various geometric formulae with different bear...Traditional model for calculating performance parameters of a fix-pad journal bearing leads to heavy workload, complicated and changeable formulae as it requires deriving various geometric formulae with different bearing types such as circular journal bearing, dislocated bearing and elliptic bearing. Considering different pad preload ratios for non-standard bearing, traditional model not only becomes more complicated but also reduces scalability and promotion of the calculation programs. For the complexly case of traditional model while dealing with various fix-pad journal bearings, unified coordinate system model for performance calculation of fix-pad journal bearing is presented in the paper. A unified coordinate system with the bearing center at the origin is established, and the eccentricity ratio and attitude angle of axis relative to each pad are calculated through the coordinates of journal center and each pad center. Geometric description of fix-pad journal bearing is unified in this model, which can be used for both various standard bearing and non-standard bearing with different pad preload ratios. Validity of this model is verified with an elliptical bearing. Performance of a non-standard four-leaf bearing with different pad preload ratios is calculated based on this model. The calculation result shows that increasing preload ratio of the pad 1 and keeping that of the left three pads constant improves bearing capacity, stiffness and damping coefficients. This research presents a unified coordinate system model unifies performance calculation of fix-pad journal bearings and studied a non-standard four-leaf bearing with different pad preload ratios, the research conclusions provides new methods for performance calculation of fix-pad journal bearings.展开更多
【目的】系统评估大语言模型(large language model,LLM)在辅助医学期刊英文摘要编校中的实际效能,并凝练可落地的编辑工作流程。【方法】选取11种代表性医学期刊的100篇中英文摘要,构建基于“术语-语法-规范-表达-逻辑”五维框架的英...【目的】系统评估大语言模型(large language model,LLM)在辅助医学期刊英文摘要编校中的实际效能,并凝练可落地的编辑工作流程。【方法】选取11种代表性医学期刊的100篇中英文摘要,构建基于“术语-语法-规范-表达-逻辑”五维框架的英文摘要评估体系,对比3种LLM对医学期刊英文摘要问题的自动检测能力,并实施双盲人工复核。【结果】3种LLM累计发现1197个问题,人工审核后共采纳1113个(93%)修改意见。LLM能有效检出英文摘要中存在的多样化问题。这些问题以术语准确性为主(408个,占36.7%),其次是表达地道性、语法正确性和学术规范性。不同LLM在评估维度上呈现一定的互补优势,协同使用可全面提升英文摘要编校质量。【结论】LLM是赋能英文摘要编校的有效辅助工具,可提升工作效率与文本质量,实践策略包括优化输入指令、多模型互补集成、结构化评估框架、明确人机边界以及坚守伦理底线等。展开更多
The "Norwegian Model" attempts to comprehensively cover all the peer-reviewed scholarly literatures in all areas of research in one single weighted indicator. Thereby, scientific production is made comparabl...The "Norwegian Model" attempts to comprehensively cover all the peer-reviewed scholarly literatures in all areas of research in one single weighted indicator. Thereby, scientific production is made comparable across departments and faculties within and between research institutions, and the indicator may serve institutional evaluation and funding. This article describes the motivation for creating the model in Norway, how it was designed, organized and implemented, as well as the effects and experiences with the model. The article ends with an overview of a new type of bibliometric studies that are based on the type of comprehensive national publication data that the Norwegian Model provides.展开更多
基金Supported by National Natural Science Foundation of China(Grant No.51275395)Major National Basic Research Development Program of China(973 Program,Grant Nos.2009CB724304-2,2009CB724404)
文摘Traditional model for calculating performance parameters of a fix-pad journal bearing leads to heavy workload, complicated and changeable formulae as it requires deriving various geometric formulae with different bearing types such as circular journal bearing, dislocated bearing and elliptic bearing. Considering different pad preload ratios for non-standard bearing, traditional model not only becomes more complicated but also reduces scalability and promotion of the calculation programs. For the complexly case of traditional model while dealing with various fix-pad journal bearings, unified coordinate system model for performance calculation of fix-pad journal bearing is presented in the paper. A unified coordinate system with the bearing center at the origin is established, and the eccentricity ratio and attitude angle of axis relative to each pad are calculated through the coordinates of journal center and each pad center. Geometric description of fix-pad journal bearing is unified in this model, which can be used for both various standard bearing and non-standard bearing with different pad preload ratios. Validity of this model is verified with an elliptical bearing. Performance of a non-standard four-leaf bearing with different pad preload ratios is calculated based on this model. The calculation result shows that increasing preload ratio of the pad 1 and keeping that of the left three pads constant improves bearing capacity, stiffness and damping coefficients. This research presents a unified coordinate system model unifies performance calculation of fix-pad journal bearings and studied a non-standard four-leaf bearing with different pad preload ratios, the research conclusions provides new methods for performance calculation of fix-pad journal bearings.
文摘【目的】系统评估大语言模型(large language model,LLM)在辅助医学期刊英文摘要编校中的实际效能,并凝练可落地的编辑工作流程。【方法】选取11种代表性医学期刊的100篇中英文摘要,构建基于“术语-语法-规范-表达-逻辑”五维框架的英文摘要评估体系,对比3种LLM对医学期刊英文摘要问题的自动检测能力,并实施双盲人工复核。【结果】3种LLM累计发现1197个问题,人工审核后共采纳1113个(93%)修改意见。LLM能有效检出英文摘要中存在的多样化问题。这些问题以术语准确性为主(408个,占36.7%),其次是表达地道性、语法正确性和学术规范性。不同LLM在评估维度上呈现一定的互补优势,协同使用可全面提升英文摘要编校质量。【结论】LLM是赋能英文摘要编校的有效辅助工具,可提升工作效率与文本质量,实践策略包括优化输入指令、多模型互补集成、结构化评估框架、明确人机边界以及坚守伦理底线等。
文摘基于文献计量方法,利用Scifinder Web数据库,从年发文量、研究机构、索引词、被引文献和施引文献等不同角度对《化工学报》、AICh E Journal、Chemical Engineering Science(CES)和Industrial&Engineering Chemistry Research(IECR)4个国内外主流化工期刊近20年(1996—2015年)发表的49565篇文献,进行了较为全面的探讨,以期为我国化工学科"双一流"建设及同类期刊的发展提供借鉴和参考。中国机构在国际期刊上日益增多的发文量和上升的发文机构排名,显示了近年来国内化工科研强劲的发展势头和国际影响力。同时,国内各机构化工学科的学术研究日益活跃,高水平学术论文成果的产出仅仅集中于少数顶尖科研机构的现象有所变化。《化工学报》与三大主流期刊AICh E Journal、CES和IECR的发文重点及热点基本一致。近10年(2006—2015年),中国机构在"聚合物形态"、"离子液体"、"纳米颗粒"等方面对三大国际期刊发文有较大的贡献。
文摘The "Norwegian Model" attempts to comprehensively cover all the peer-reviewed scholarly literatures in all areas of research in one single weighted indicator. Thereby, scientific production is made comparable across departments and faculties within and between research institutions, and the indicator may serve institutional evaluation and funding. This article describes the motivation for creating the model in Norway, how it was designed, organized and implemented, as well as the effects and experiences with the model. The article ends with an overview of a new type of bibliometric studies that are based on the type of comprehensive national publication data that the Norwegian Model provides.
